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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae658e6cc77f08a9da7b1ce727dfb1f7dd8521aed1c841a86361a387eb7050bc' 
  AND token = 'RFiEPxk3bM/8FD5NyDBzvTFKu6CDRMdvS9tyH/UKcaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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