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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5280d833a0cc6c4cb6946a71eeca81a54affa434330472e2b6d609f46a7eeada' 
  AND token = 'oG55H3011akBhldba5YUWOVtKc2wLQYdeSlqNedlu98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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