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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd914ee6b3a0cde6f2371e8f97611f45dfffcf6602b2225d28a8ef6ad2f113fec' 
  AND token = '29P8O2Usa5wT0JA+O0AUua896PR5mG1maFiV0RC17K4=' 
  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"
    }
  }
}