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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7b5dfca0d3ea80d56122565d4701e706f7d575c68d1276e07d9139dfc83ddc0' 
  AND token = 'N+1pSihjf8CTrp6MBNxoJqa2RoMZyFXB4EsIrfLtCk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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