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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d01ed8a24cfe4e8d03ffc7a81c46b78c71f111c69aac44ce4c112259d19d0db' 
  AND token = 'hy1LRStimVE8yVZOlYv6XHDaPyYwklpb1pKxt/PET2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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