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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5c04f626252491df617b239e182c0e4bcd79b8da1a41a641cd370271da87ff5' 
  AND token = 'IzgFuF6ldaDgir+ursprAyfEssPXiywv+gqJyG8AT1I=' 
  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"
    }
  }
}