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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0452adfd131717cdeae97609151f45bb6efd11dce33ac35db6c5cccd6deb74b6' 
  AND token = 'LzQwf/sp9QYtU88H0uO6iginntzGNA3CPEDQ9l0+AqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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