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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57e2394f8ec875682cc0220eee014220c2f24ffd18c8d9e35031c3994c9ca308' 
  AND token = 'kPcj3U4MKCVES7/NC/n8+g8nXfEoeYacJViKSHqqFtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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