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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73f57c9201aaeb27d6c4a4b6d93294a16c66e5867b992a9010e5f1d0ded123d2' 
  AND token = '2Dtqy6Z6ceGPWXNvBq5I8oeWuBswb6nC1bdUw3W/f+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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