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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5c27eba9bc37d2b093b125a91eaddc65f5767884c1ae12ad3eb0690862e9989' 
  AND token = 'A4yfiI0IK/+d9ORcLKL8nOqtRK6uI0dHwuv4qd1oo8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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