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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd0fad011324fa11a4b48e987cdbe7094d52f0a0d0c239435e83d1124b9d2fa4' 
  AND token = 'TsbBnm2kNmVKFph/eciSRh3mxGreH1iBtODXEY8nLbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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