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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6aa026c66fc557729c75a1942763a09267a1c881668b35e4c3538325149867f' 
  AND token = 'QyGMym+dlVl7eWn9QeEUP6VgGSHImW2XPB5kTZETaxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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