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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71720cd7c3dba50702289b5436aab899fc909a2649435d84377c5e1265020499' 
  AND token = 'woqqW9boTgfixpvKQTAcHwteKKC0v34k4UKaIPFPC3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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