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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a13963b7893c10e84190b7c16d1116ea8221e2ec03eb83fce09e351187213de' 
  AND token = '70Vl/GZm/1hy63Xh8R2fqRtMbybD97Vi59vZSFxCI4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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