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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79e710666bf3fe4c217a482c74f64b24af6e81aca553e5030912d49455c144f5' 
  AND token = 'icfSd6Y7FHJy3RFfD4g3LEsuh+FUrF6R4suP866BuH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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