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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02cc9db8d846039a4f2940d97bd6f98ada58b2347ec772952b9d14a120db093b' 
  AND token = 'BeCFXwiqy7PVgqc06Rx6wsA1pqRuQ6B/aew4VTXX+mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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