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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14da6b2a923199e1ea53013c1bf020a1f140b1d0f8105553ffbabc904f1d7fd6' 
  AND token = 'qdt5G9CWIVIamAzk/pyt/xT5dOOyu0lwPMYmu3Q/g7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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