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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb2e2e0cc538b4e22ef28b45d7f8623ac1d4acc76c889fc8cfdee167f5b4fa2f' 
  AND token = 'AXFFkWG1qoVVUkLImmoPIyrn83BxyI7kMe5pkVFtb1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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