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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e6473ed767feeb6cb8d24c7ef6e7a8a1819aa213dd541c53a2f24d3d682c076' 
  AND token = 'qlDm1dRLyuk/CpYHwc42a32AJu5zf5RsAwhZAX84iXo=' 
  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"
    }
  }
}