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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daf839a61a09c731d63862a78bc4ffefb8243dc193ac8cb6e7576e957a335626' 
  AND token = '33LaUj2LPlHi2P7g/VwDj+k8W2kdeELbAVqYJApHFLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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