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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8eccbe3bcde94afca008cb61ab3ee8144c8d6bf6c8166aed045237dec747972' 
  AND token = '5yN35lKD1hU4M0Mvy9Sit6av2g7q3mqBPkVIR8qbtK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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