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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '042f7b0d23eeb130b484c4d44f2db6bce20916c3225b73d87b72bac355fe0f45' 
  AND token = 'HIOU8jFAGFxABwpWP3wik6JSvt5p0e5zseahXOkg7XQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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