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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ebc04031acb2b31e24e9b014c3165324a01fd03400ae7c27daa687ec390c031' 
  AND token = 'Bm7XnAdJ+ytNHEs28r+pAAyr601E3Ij2YrfVSwGfUHk=' 
  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"
    }
  }
}