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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abc617835efce718f94b281e376911b2078c6b0ed6cf47cc2fb8655f223e1d21' 
  AND token = 'djSsCTkmCx13oaie2Q4f1YDloeIBUDXRAEcy9Dzy+GQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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