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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f38ff2d49638fe0e92b1c66ea25d03de2946aceb89c523f352ea6527b89bda1c' 
  AND token = '7o1yAH/2V0KGG0JcfLDSh4MkxjWtBgauRUyR7M7Dyc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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