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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a2d8145cd394c195a3c80d857531ddb9226452683fea056f909fe22e11255ff' 
  AND token = '9v1jBddfs7uXgyV2S1n3ZHIkplupB5bLAc1Ri24hRFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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