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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '738527c43f90828d8bec5050a33533862184b08f30acb2ae81bed12dd34719f8' 
  AND token = 'EAhJa+mp6Mkhu7CaS1BJfssv/P2m+CCX8C5ZlmyhQ2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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