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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3444619b82c1f78ed13e3330f9484424308141d5ab31235c08d05bde0bc05718' 
  AND token = '1DCRfJvMrrFfs5Wlt+4bn5PLDt+egqTVw3luzGqI7BI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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