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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '56b2ec2ec9bc2eabbaab594d891443bd155f97ae4441c5ce0ade0f3da04471b0' 
  AND token = 'gIIuUpowHO5cGNbVj8GCC0im1pshuifRbQYziQt/wm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00792

JSON explain

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