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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09c7eb0013c105598838e8774b6bc0b6c3c8ff1a028c37e4a6f4bc1879009d3d' 
  AND token = 'rLpi+DxttHc4X1e44pMzcbECZSxHlGWUI0df0uK2fqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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