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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '760efd6734423e3e1d26abe0fb0adc4b441961dbb416a6784d4f707c57f6c941' 
  AND token = 'cqHJxgyfVpxmu+ofvmuFe5DXOsQdHCVpoN+O/sljxTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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