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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4806289636370c0e74302464d153c7d6f458c4bf4cfa2a54d72c75dfba610d9' 
  AND token = 'y3r8mHxfIDvaZG/D5Wgx1Ydgqn7AlFnQ4O1r0x0XKvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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