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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f4607bbcd1fb699be8a3930b6a1d92061bec8c58527fcf3b057bde1739c43af' 
  AND token = 'ft0l+KDR7B6H9+xwSK7SH9psqMCscsSTiSLfWNRKvDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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