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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75af84ea3397236a814e3d40162040358f95167b025fc4cb6fcfffe97ee52420' 
  AND token = 'PH5qbr+jMz/C2qLfxxqLlT4D70IvMHNgKgcC732E7qs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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