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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '291f95a3ea1887731a39376f21b87939ecfac5f1edd803d1509a2c924a886a1c' 
  AND token = 'xU6MtknA1+xs4PxQWVACzQq5k+t+v+yryyP4P8IZD8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00821

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}