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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e72ac3e77057641af1523dd5579c3b99ea52e6b05a7ee5856e6e7121da2cf2fd' 
  AND token = 'i2r1KI6uzYd4ZQXpZK/SZQTY7pG8s4reDqhx6EtU7mo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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