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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68e16eb50fbf24e39e9d60cd0a6bf59bb218808d10a2be5f2c2982737a718668' 
  AND token = '7kivu2+Ha+AC6KNik9C67G4QW41kLXPJO3cWRBoQSDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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