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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8058522e66070f19320e027889080b3417651ec3e8f7608e699c30591ee0d85' 
  AND token = '4oH3uT8cYPAmRlPnhnys30+NGbHZWK/oytGM7puq8K4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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