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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f488b70f2f9ccd7c1343cf29bab9558e92c642e2f6047f031b05f378f1f300fe' 
  AND token = 'TP84z7t2oXTyqFcNQeBE1qR/ERViE2IJA/rCIy5IJ4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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