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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e10977d8a8d747bb1ac5fe69caac69ed1c998ce447ff54f6916ad5783ce5580' 
  AND token = '53ZxZEhzqP7C1Pt7UaFCsuWp8mMb1YvhwDd546m7ISQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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