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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '77458184ef96825e678a0d1c492d0f5372691e5428354b6dfbabf66a3a440aa6' 
  AND token = 'zRcSO4FcqNTDPFsWLnsRNWZXg35ExBsXxmwDe7c4qz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00760

JSON explain

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