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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de626b26c1a166e56a9e613e76062a7c77bc15f6fee5badc5f4f563be4a1200e' 
  AND token = 'vAiVqObbDEAnYRhWelT4VsNux2fJSoV7wP/VYw3p9YY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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