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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '738e1e6cdbc972acf570bd8ef69269f5231cf952f8803ae8f0098f5e13ae726d' 
  AND token = 'p3rb2roEnBkF/SIcnRsxGYxmT0aAsBqflt0fVr2c+l0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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