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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbd2779fc3504a264618ab598c5f07bc13b212d2fe87a00fe9753a878915cfc9' 
  AND token = '/8xy7rfYIV2vnVAdVK+ciCDX3ovu2Tb54BAREwOty10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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