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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db5a6bfac35bd6848750db3a5a23e40b4759588f84fc41f2e0588f37b9d5ca34' 
  AND token = 'pBOQFTYQtMwbLkTIh16iHzpDdHCdlNdjV9mR+Z0dzRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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