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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7e72dc419668e0ea7135c1c0177f980d3b717da555f66bc387d5d1b3a19cfed' 
  AND token = '8B4LZpLKATjzVRiaRkc1b2ls1HS+PS99RrlUQDQgxjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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