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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c12c013f3495c8c5c1c05ad859eb8a6ca38ffb58a009eb397ca36de07567d32' 
  AND token = '604S5Zuewtz1raSl0u1fIo2omELX9uETVMQU8yszS+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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