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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '261e9368083d90a86bbb4db6c507d218541de67c5ceeea9e8d9e0b15dd76b596' 
  AND token = 'IrQK50qOWoBBvppm0zWLVxJ05a6V0o8kWRc8h98U7h8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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