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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'f551f311ded93e688035e62e1f4dc660389e0b790fcf7ad36227622987d38615' 
  AND token = 'W9USJJ+NUHrQqEUChmnGxzgn0XNe1H16rTUwSuzqa0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00769

JSON explain

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