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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd134b28f4fc99f5008ff04d009732a913a5926eee7e5343aa2224c597b7fb47b' 
  AND token = 'z4UR7+H78KYEknRt8ny7hYzfD9uVw6/zalylR2eRxKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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