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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a6d09b76ddb6a92664d8516b0968bf28462e00831297f30c8a0203a7de1c9eb' 
  AND token = 'q/DdaJaNafqVJnQUdNV7F29r6Fg29F5Drmd87pz1UR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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